[1]Endoscopy Division;
National Cancer Center Hospital;
Tokyo 104-0045;
Japan;
[1]Endoscopy Division;
National Cancer Center Hospital;
Tokyo 104-0045;
Japan;
[1]Endoscopy Division;
National Cancer Center Hospital;
Tokyo 104-0045;
Japan;
[2]Cancer Screening Division;
Research Center for Cancer Prevention and Screening;
National Cancer Center Hospital;
Tokyo 104-0045;
Japan;
[1]Endoscopy Division;
National Cancer Center Hospital;
Tokyo 104-0045;
Japan;
[1]Endoscopy Division;
National Cancer Center Hospital;
Tokyo 104-0045;
Japan;
[1]Endoscopy Division;
National Cancer Center Hospital;
Tokyo 104-0045;
Japan;
[2]Cancer Screening Division;
Research Center for Cancer Prevention and Screening;
National Cancer Center Hospital;
Tokyo 104-0045;
Japan;
[1]Endoscopy Division;
National Cancer Center Hospital;
Tokyo 104-0045;
Japan;
Colonoscopy; Colorectal tumors; Endoscopic surgical procedure; Emergencies; Intestinal perforation;